Replies

1. 
   WillGeorge | Jun 09, 2005 05:44pm | #1

   My Jet runs 1725.. No way to change speed for different bits..

   I have no idea about 'High End' stuff...

2. 
   Buzzsaw | Jun 09, 2005 07:33pm | #2

   My drill press shows the different speeds based on the hardness of the wood being drilled into. I would imagine that you would have to factor this in as well.

   Regards,

   Buzzsaw

1. 
   WillGeorge | Jun 09, 2005 08:25pm | #3

   Ya but ya got a GOOD one with different speeds?

3. 
   jackplane | Jun 09, 2005 08:33pm | #4

   In general, the larger the diameter of the bit, the slower the drill speed. This is because more resistance is encountered with a larger bit.

    As noted the hardness of the wood or substrate also matters. I can't give you specifics but a google search for your drill press manual should help.

    

4. 
   seankzn | Jun 09, 2005 10:28pm | #5

   Tim,

   I use a Boss vertical chisel morticer running at a set 2850rpm for all chisels between 6 and 12mm, slowing my descent speed on the bigger chisels.

   Regards

1. 
   chills1994 | Jun 10, 2005 09:36am | #6

   somewhere out there in just the past few months some WWing mag did a spiel on mortising and they also covered how to do it on the drill press.

   remember little bites, withdraw the bit and chisel to clear out the chips.

   like to have the little window pointing towards me so the shavings don't get in the way or jammed under the hold down

   check this out

   22736.1

   Chills

1. 
   georgek | Jun 10, 2005 04:00pm | #8

   Chills, I would suggest you point that little window in the direction you are feeding the stock. The way you have it set up, the chips are ejected against the mortise wall, causing the bit to flex and work harder. Give it a try, you'll find it much smoother.

   George

5. 
   philip | Jun 10, 2005 11:24am | #7

   Tim,
   I have a dedicated h/s morticer eqipped to do up to 1" -the bloody motor has one speed only- 2850 rpm (going on memory-could be 3200). This is fine enough for sizes up to 1/2", provided everthing is sharp and set properly.
   I have noticed that the manufacturers of these h/square chisels like to specify seemingly high speeds.
   If it were possible I would want a range of say 3 speeds-selected according to size and type of timber.
   So, to answer yr question and since you have a drill press presumably with a range of speeds:for 1/4 to 1/2 sizes anything up to around 3000rpm, but if there is too much smoke reduce speed and be sure it is sharp and well set. You have to feed Firmly i.e don't #### around,but obviously it should not be forced. Better to reduce speed than to over heat.
   They work well, but can be tricky for the uninitiated. In the absence of anything better I use this method for mortices all the time, so have learned a trick or two.
   Well I'll be danged-I see there was a spontaneous censor there-and it wasn't even a four letter word!

   
   

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   Edited 6/10/2005 4:30 am ET by mookaroid

6. 
   mike4244 | Jun 10, 2005 09:59pm | #9

   I used to mortise with a drill press, now use a  router. The router is set up on a plywood disk that that raises or lowers for height. The router base is vertical , perpendicular to the table.

   When I did use the drill press. I ran the it slow, about 600 rpm's. This prevents the bit from getting hot, also works for 1/4" up to 1/2" bits. Never tried larger mortices.

   It would seem to me since the bits are auger bits , a fast speed is counter productive to mortising.Try it slow, then try it fast, I think you will like the slow speed better.

   mike